Malicious PDF — malware analysis report

Static analysis result for SHA-256 c522735f6d3cfb01…

MALICIOUS

PDF

90.4 KB Created: 2021-07-08 08:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c74385e20e4df167a35e16bf266a9dee SHA-1: 45e3fdb5428e41ec833494f5ad6518bd53987e5b SHA-256: c522735f6d3cfb013c23018e45695656af7e23a0c62a3af5a7d8c215d6e0159d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised or disposable hosting domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://hrzservices.com/uploadfiles/file/dasobarasigoxew.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcfce5500e---gewokewilixomun.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/4ae7016ba990a27b7500d515297abf97/9137486278.pdf
    • http://mariopresto.pl/userfiles/file/fawane.pdf
    • http://bigband-ulm.de/userfiles/files/88209402583.pdf
    • http://villapellegrino.it/userfiles/files/87059694196.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/6b9li0lhvk67cfc5koqfllrvt5/15500415417.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0a0b58c19---85084442428.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609563233075d---wedoropeluzezuvirox.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a624116ddc4---riwoxiwin.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/78f7032d43c1d103f0c9068390902dd1/zavixijuzokefowe.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072cbc2f4067---33963914513.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/3j1lkrec8o5pvf0mpjh7fmr89a/40084172185.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/c4df25c05bb8d95dea95044e298e0e28/69991208976.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/f7332d9238db5e3c1df2ff01faa84701/91605276014.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/d6f9ff31a6605c6f294e5448c2e68887/62009114026.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/e60cb0ed21fc6ba2d02290a537830ee5/masedibodudu.pdf
    • http://all-pass.com/folder/editor/file/fusukikebiwapefid.pdf
    • http://schodylux.pl/userfiles/file/68488403293.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/jiqd4kgc7vrdvbrsce16va443s/28803688448.pdf
    • http://stasta.com/userfiles/file/71234305174.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/2ffo4na6pa83qfo1hsrkmdss15/togozibizuvosumivivelux.pdf
    • http://asijskepotraviny.cz/files/file/14564928836.pdf
    • http://blackshirts1960.com/clients/876325/File/12097993699.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=correct+order+to+watch+the+marvel+films
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fded.bin
7557eb0555203658514108494ecb130fc6a43099dd3b3f20835afa3015754a87
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDED 10820 bytes
font_01_sfnt_off000116fe.bin
2f931f0f4cd8be6f2d07a3d1219a93e3226da7e623cc4b1b7a368eeb42deda40
pdf-font-stream PDF embedded font (sfnt) at offset 0x116FE 17572 bytes
font_02_sfnt_off00014420.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14420 16792 bytes